/* ==========================================================================
   无锡澎湃电驱动科技有限公司 · 美蒂斯 MEIDISI 官网样式
   纯静态站点，无外部依赖（字体使用系统字族）
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  --navy-950: #050b1e;
  --navy-900: #0a1330;
  --navy-800: #101d47;
  --brand-700: #1739a8;
  --brand-600: #1e4fd8;
  --brand-500: #2f6bff;
  --brand-050: #eef3ff;
  --accent: #00d4ff;

  --ink: #101828;
  --ink-2: #4a5567;
  --ink-3: #7b8698;
  --line: #e3e8f0;
  --soft: #f5f7fb;
  --white: #ffffff;

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .04);
  --shadow: 0 10px 30px -12px rgba(16, 24, 40, .18);
  --shadow-lg: 0 30px 60px -24px rgba(10, 19, 48, .35);

  --container: 1200px;
  --header-h: 76px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--header-h) + 16px); }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Source Han Sans SC", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--white);
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--brand-600); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--brand-500); }
h1, h2, h3, h4 { margin: 0; line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
p { margin: 0; }
ul, ol, dl, dd, dt { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; cursor: pointer; }
input, select, textarea { font: inherit; }
table { border-collapse: collapse; width: 100%; }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 24px; }
.en { font-size: .82em; color: var(--ink-3); letter-spacing: .01em; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--brand-600); color: #fff; padding: 10px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

:focus-visible { outline: 2px solid var(--brand-500); outline-offset: 3px; border-radius: 4px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border: 1px solid transparent; border-radius: 999px;
  font-size: 15px; font-weight: 600; line-height: 1; white-space: nowrap;
  transition: transform .2s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), color .2s var(--ease), border-color .25s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: 10px 18px; font-size: 14px; }
.btn-lg { padding: 15px 28px; font-size: 16px; }
.btn-block { width: 100%; }

.btn-primary { background: linear-gradient(135deg, var(--brand-500), var(--brand-600)); color: #fff; box-shadow: 0 10px 24px -10px rgba(30, 79, 216, .75); }
.btn-primary:hover { color: #fff; box-shadow: 0 16px 32px -12px rgba(30, 79, 216, .85); }

.btn-ghost { background: rgba(255, 255, 255, .08); color: #fff; border-color: rgba(255, 255, 255, .28); backdrop-filter: blur(8px); }
.btn-ghost:hover { background: rgba(255, 255, 255, .16); color: #fff; border-color: rgba(255, 255, 255, .5); }

.btn-outline { background: transparent; color: var(--brand-700); border-color: #c8d5f2; }
.btn-outline:hover { background: var(--brand-050); color: var(--brand-700); border-color: var(--brand-500); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(10, 19, 48, .55);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  transition: background .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, .92);
  border-bottom-color: var(--line);
  box-shadow: 0 6px 24px -16px rgba(10, 19, 48, .4);
}
.header-inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}

.brand { display: inline-flex; align-items: center; gap: 11px; color: #fff; }
.brand:hover { color: #fff; }
.brand-logo { width: auto; height: 44px; flex: 0 0 auto; }
.brand-text { display: flex; flex-direction: column; gap: 5px; line-height: 1.1; }
.brand-word { height: 19px; width: auto; }
.brand-text small { font-size: 11px; color: rgba(255, 255, 255, .62); letter-spacing: .04em; white-space: nowrap; }

/* logo 深浅两版：深色页头用白色版，滚动后的浅色页头换成深色版 */
.logo-on-light { display: none; }
.site-header.is-scrolled .logo-on-dark { display: none; }
.site-header.is-scrolled .logo-on-light { display: inline-block; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  position: relative; padding: 9px 14px; border-radius: 10px; white-space: nowrap;
  font-size: 15px; font-weight: 500; color: rgba(255, 255, 255, .86);
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav a:hover { color: #fff; background: rgba(255, 255, 255, .1); }
.nav a.is-active { color: #fff; }
.nav a.is-active::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 3px; height: 2px;
  border-radius: 2px; background: linear-gradient(90deg, var(--accent), var(--brand-500));
}
.header-actions { display: flex; align-items: center; gap: 12px; }

/* 语言切换 */
.lang-switch {
  display: inline-flex; align-items: center; gap: 2px; padding: 3px;
  border-radius: 999px; background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .22);
}
.lang-btn {
  padding: 6px 13px; border: 0; border-radius: 999px; background: transparent;
  color: rgba(255, 255, 255, .72); font-size: 13px; font-weight: 700; line-height: 1.2;
  letter-spacing: .02em; transition: background .25s var(--ease), color .25s var(--ease);
}
.lang-btn:hover { color: #fff; }
.lang-btn.is-active { background: #fff; color: var(--brand-700); }
.site-header.is-scrolled .lang-switch { background: var(--soft); border-color: var(--line); }
.site-header.is-scrolled .lang-btn { color: var(--ink-2); }
.site-header.is-scrolled .lang-btn:hover { color: var(--brand-700); }
.site-header.is-scrolled .lang-btn.is-active { background: var(--brand-600); color: #fff; }

.site-header.is-scrolled .brand { color: var(--ink); }
.site-header.is-scrolled .brand-text small { color: var(--ink-3); }
.site-header.is-scrolled .nav a { color: var(--ink-2); }
.site-header.is-scrolled .nav a:hover { color: var(--brand-700); background: var(--brand-050); }
.site-header.is-scrolled .nav a.is-active { color: var(--brand-700); }

.nav-toggle {
  display: none; width: 44px; height: 44px; border: 2px solid rgba(255, 255, 255, .3);
  border-radius: 12px; background: transparent; padding: 0;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle span { display: block; width: 20px; height: 2px; background: #fff; border-radius: 2px; transition: transform .3s var(--ease), opacity .2s var(--ease); }
.site-header.is-scrolled .nav-toggle { border-color: var(--line); }
.site-header.is-scrolled .nav-toggle span { background: var(--ink); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.scroll-progress {
  height: 2px; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--brand-500));
  transition: width .1s linear;
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 72px) 0 0;
  background:
    radial-gradient(120% 90% at 82% 8%, #16307d 0%, rgba(10, 19, 48, 0) 55%),
    linear-gradient(180deg, #0a1330 0%, #0c1740 55%, #0a1330 100%);
  color: #fff;
  isolation: isolate;
}
.hero-bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; }
.glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; }
.glow-1 { width: 620px; height: 620px; top: -220px; right: -140px; background: radial-gradient(circle, rgba(47, 107, 255, .75), transparent 65%); }
.glow-2 { width: 520px; height: 520px; bottom: -180px; left: -160px; background: radial-gradient(circle, rgba(0, 212, 255, .42), transparent 65%); }
.grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(120% 80% at 50% 30%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 80% at 50% 30%, #000 30%, transparent 78%);
}

.hero-inner {
  display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 56px;
  padding-bottom: 72px;
}

.pill {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px 7px 12px; border-radius: 999px;
  background: rgba(0, 212, 255, .1); border: 1px solid rgba(0, 212, 255, .3);
  color: #a8e7ff; font-size: 13.5px; font-weight: 600; letter-spacing: .02em;
}
.pulse {
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 0 rgba(0, 212, 255, .8); animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 212, 255, .7); }
  70% { box-shadow: 0 0 0 10px rgba(0, 212, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0); }
}

.hero h1 {
  margin: 22px 0 14px;
  font-size: clamp(2.3rem, 4.6vw, 3.6rem);
  font-weight: 800; letter-spacing: -.02em; line-height: 1.16;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, #7fe9ff 0%, #59a6ff 45%, #b8c8ff 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-en {
  font-size: 12.5px; letter-spacing: .16em; text-transform: uppercase;
  color: rgba(255, 255, 255, .5); margin-bottom: 20px;
}
.hero-lead { max-width: 30em; color: rgba(255, 255, 255, .78); font-size: 16.5px; }
.hero-lead b { color: #fff; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 32px 0 26px; }

.hero-badges { display: flex; flex-wrap: wrap; gap: 10px 22px; }
.hero-badges li {
  position: relative; padding-left: 22px;
  font-size: 14px; color: rgba(255, 255, 255, .7);
}
.hero-badges li::before {
  content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px; border-radius: 50%;
  background: rgba(0, 212, 255, .16);
  box-shadow: inset 0 0 0 1px rgba(0, 212, 255, .5);
}
.hero-badges li::after {
  content: ""; position: absolute; left: 4.5px; top: 50%; width: 5px; height: 3px;
  border-left: 1.5px solid var(--accent); border-bottom: 1.5px solid var(--accent);
  transform: translateY(-70%) rotate(-45deg);
}

/* 首屏产品图 */
.hero-visual { position: relative; }
.hero-shot {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .14);
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, .12);
  aspect-ratio: 4 / 3; background: linear-gradient(140deg, #12224f, #060d24);
}
.hero-shot img { width: 100%; height: 100%; object-fit: cover; }
.hero-shot-tag {
  position: absolute; left: 16px; bottom: 16px;
  padding: 7px 14px; border-radius: 999px; font-size: 12.5px; font-weight: 600; letter-spacing: .03em;
  background: rgba(6, 13, 36, .62); color: #cfe6ff; border: 1px solid rgba(255, 255, 255, .18);
  backdrop-filter: blur(8px);
}

.float-card {
  position: absolute; display: flex; flex-direction: column; gap: 2px;
  padding: 12px 16px; border-radius: 14px;
  background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .2);
  backdrop-filter: blur(14px); box-shadow: 0 18px 40px -20px rgba(0, 0, 0, .8);
  animation: floaty 5.5s ease-in-out infinite;
}
.float-card .fc-num { font-size: 20px; font-weight: 800; letter-spacing: -.01em; }
.float-card .fc-num i { font-style: normal; font-size: 12px; color: var(--accent); margin-left: 2px; }
.float-card .fc-label { font-size: 11.5px; color: rgba(255, 255, 255, .68); letter-spacing: .04em; }
.float-1 { top: 26px; left: -26px; animation-delay: 0s; }
.float-2 { bottom: 78px; right: -22px; animation-delay: 1.2s; }
.float-3 { top: -22px; right: 46px; animation-delay: 2.1s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-9px); }
}

/* 首屏数据条 */
.hero-stats {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 8px; padding: 26px 10px; margin-bottom: -46px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .12);
  backdrop-filter: blur(16px);
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .8);
}
.hs-item { text-align: center; padding: 6px 8px; border-right: 1px solid rgba(255, 255, 255, .1); }
.hs-item:last-child { border-right: 0; }
.hs-item b { display: block; font-size: clamp(1.3rem, 2.4vw, 1.75rem); font-weight: 800; letter-spacing: -.02em; }
.hs-item b i { font-style: normal; font-size: .58em; color: var(--accent); margin-left: 2px; }
.hs-item span { font-size: 12.5px; color: rgba(255, 255, 255, .62); }

/* ---------- 能力滚动条 ---------- */
.trustbar {
  padding: 0 0 22px;
  background: linear-gradient(180deg, #0a1330 0, #0a1330 46px, #ffffff 46px);
}
.trustbar-viewport {
  padding-top: 76px;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.trustbar-track {
  display: flex; align-items: center; gap: 26px; width: max-content;
  animation: marquee 34s linear infinite;
}
.trustbar-track span { font-size: 15px; font-weight: 600; color: var(--ink-3); white-space: nowrap; letter-spacing: .02em; }
.trustbar-track i { font-size: 8px; color: #c3cfe6; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.trustbar:hover .trustbar-track { animation-play-state: paused; }

/* ---------- 子页顶部横幅 ---------- */
.page-hero {
  position: relative; overflow: hidden;
  padding: calc(var(--header-h) + 60px) 0 58px;
  color: #fff; isolation: isolate;
  background:
    radial-gradient(110% 100% at 80% 0%, #16307d 0%, rgba(10, 19, 48, 0) 56%),
    linear-gradient(180deg, #0a1330 0%, #0d1a42 100%);
}
.page-hero-bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; }
.page-hero .container { position: relative; }

.breadcrumb { display: flex; align-items: center; gap: 9px; margin-bottom: 16px; font-size: 13px; color: rgba(255, 255, 255, .55); }
.breadcrumb a { color: rgba(255, 255, 255, .78); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb i { font-style: normal; color: rgba(255, 255, 255, .32); }
.breadcrumb .crumb-en { font-size: 11.5px; letter-spacing: .12em; }

.page-hero h1 { font-size: clamp(1.9rem, 3.8vw, 2.8rem); font-weight: 800; letter-spacing: -.02em; }
.page-hero-en {
  display: block; margin-top: 12px;
  font-size: 12px; font-weight: 600; letter-spacing: .2em; text-transform: uppercase;
  color: var(--accent);
}
.page-hero-lead { max-width: 48em; margin-top: 16px; color: rgba(255, 255, 255, .76); font-size: 16px; }
.page-hero + .section { padding-top: 78px; }

/* ---------- 行动号召条 ---------- */
.cta-band {
  padding: 56px 0;
  color: #fff;
  background: radial-gradient(90% 140% at 88% 10%, rgba(0, 212, 255, .18), transparent 60%),
              linear-gradient(120deg, #0d1c46, #16307d 58%, #1a3a97);
}
.cta-band .container { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-band h2 { font-size: clamp(1.3rem, 2.6vw, 1.8rem); margin-bottom: 8px; }
.cta-band p { color: rgba(255, 255, 255, .78); font-size: 15.5px; }
.cta-band-actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* 区块底部的“查看全部” */
.section-more { margin-top: 36px; text-align: center; }

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; }
.section-soft { background: var(--soft); }
.section-dark {
  position: relative; color: #fff;
  background:
    radial-gradient(90% 70% at 15% 0%, rgba(30, 79, 216, .35), transparent 60%),
    linear-gradient(180deg, #0a1330, #0b1640 60%, #0a1330);
}
.section-head { max-width: 760px; margin-bottom: 52px; }
.section-head .eyebrow {
  display: inline-block; margin-bottom: 12px;
  font-size: 12px; font-weight: 700; letter-spacing: .2em;
  color: var(--brand-600);
}
.eyebrow.light { color: var(--accent); }
.section-head h2 { font-size: clamp(1.75rem, 3.2vw, 2.4rem); margin-bottom: 14px; }
.section-head p { color: var(--ink-2); font-size: 16.5px; }
.section-head.light p { color: rgba(255, 255, 255, .74); }

/* 滚动出现动画 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 核心优势 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.adv-card {
  padding: 30px 26px; border-radius: var(--radius);
  background: var(--white); border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #cfdcf7; }
.adv-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; margin-bottom: 18px; border-radius: 14px;
  background: linear-gradient(140deg, var(--brand-050), #dfe9ff);
  color: var(--brand-600);
}
.adv-icon svg { width: 24px; height: 24px; }
.adv-card h3 { font-size: 18px; margin-bottom: 10px; }
.adv-card p { color: var(--ink-2); font-size: 14.8px; }

.adv-highlight {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center;
  margin-top: 30px; padding: 42px 44px; border-radius: var(--radius-lg);
  background: linear-gradient(120deg, #0d1c46, #16307d 60%, #1a3a97);
  color: #fff; box-shadow: var(--shadow-lg);
}
.adv-highlight h3 { font-size: clamp(1.3rem, 2.4vw, 1.7rem); margin-bottom: 14px; }
.adv-highlight p { color: rgba(255, 255, 255, .78); font-size: 15.5px; }
.ah-list { display: grid; gap: 12px; }
.ah-list li {
  padding: 14px 18px; border-radius: 12px;
  background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .14);
}
.ah-list b { display: block; font-size: 15px; color: #fff; }
.ah-list span { font-size: 13.5px; color: rgba(255, 255, 255, .68); }

/* ---------- 性能数据 ---------- */
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.data-item {
  padding: 26px 20px; border-radius: var(--radius); text-align: center;
  background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .12);
  transition: background .3s var(--ease), transform .3s var(--ease);
}
.data-item:hover { background: rgba(255, 255, 255, .09); transform: translateY(-4px); }
.data-item b {
  display: block; font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; letter-spacing: -.02em;
  background: linear-gradient(100deg, #ffffff, #7fd8ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.data-item b i {
  font-style: normal; font-size: .52em; margin-left: 3px; letter-spacing: .02em;
  background: none; -webkit-text-fill-color: var(--accent); color: var(--accent);
}
.data-item span { display: block; margin-top: 6px; font-size: 13.5px; color: rgba(255, 255, 255, .72); }
.data-item span i { font-style: normal; font-size: 11.5px; color: rgba(255, 255, 255, .45); }

/* ---------- 产品中心 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.filter-btn {
  padding: 9px 20px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--white); color: var(--ink-2); font-size: 14.5px; font-weight: 600;
  transition: all .25s var(--ease);
}
.filter-btn:hover { border-color: #c8d5f2; color: var(--brand-700); }
.filter-btn.is-active {
  background: linear-gradient(135deg, var(--brand-500), var(--brand-600));
  border-color: transparent; color: #fff;
  box-shadow: 0 10px 22px -12px rgba(30, 79, 216, .8);
}

.prod-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.prod-card {
  display: flex; flex-direction: column; overflow: hidden;
  border-radius: var(--radius); background: var(--white);
  border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease), opacity .3s var(--ease);
}
.prod-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #cfdcf7; }
.prod-card.is-hidden { display: none; }
.prod-media {
  position: relative; aspect-ratio: 4 / 3; overflow: hidden;
  background: linear-gradient(160deg, #f7f9fc, #eaeff8);
  border-bottom: 1px solid var(--line);
}
.prod-media img { width: 100%; height: 100%; object-fit: contain; padding: 14px; transition: transform .5s var(--ease); }
.prod-card:hover .prod-media img { transform: scale(1.06); }
.prod-body { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.prod-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.prod-head h3 { font-size: 19px; letter-spacing: .01em; }
.prod-head h3 small { font-size: 12px; font-weight: 600; color: var(--ink-3); margin-left: 4px; }
.tag {
  font-size: 11.5px; font-weight: 700; letter-spacing: .06em;
  padding: 3px 9px; border-radius: 6px;
  background: var(--brand-050); color: var(--brand-700); border: 1px solid #d5e0fa;
}
.tag-m { background: var(--brand-050); color: var(--brand-700); border-color: #d5e0fa; }
.tag-p { background: #eafaf1; color: #087443; border-color: #c3ecd5; }
.tag-h { background: #fff2e8; color: #b54708; border-color: #fbdcc2; }
.prod-sub { font-size: 13.5px; color: var(--ink-3); }

.spec-list { display: grid; gap: 1px; background: var(--line); border-radius: 10px; overflow: hidden; }
.spec-list > div { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 8px 12px; background: #fbfcfe; }
.spec-list dt { font-size: 12.5px; color: var(--ink-3); }
.spec-list dd { font-size: 13px; font-weight: 600; color: var(--ink); }

/* 选型表 */
.spec-table-wrap { margin-top: 36px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); overflow: hidden; }
.spec-table-wrap summary {
  padding: 18px 24px; cursor: pointer; font-weight: 700; font-size: 15.5px;
  background: var(--soft); color: var(--brand-700); list-style: none;
}
.spec-table-wrap summary::-webkit-details-marker { display: none; }
.spec-table-wrap summary::after { content: "＋"; float: right; font-weight: 700; }
.spec-table-wrap[open] summary::after { content: "－"; }
.table-scroll { overflow-x: auto; }
.spec-table { min-width: 900px; font-size: 14px; }
.spec-table th, .spec-table td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
.spec-table thead th { background: #f9fbfe; font-size: 13px; color: var(--ink-2); font-weight: 700; }
.spec-table tbody tr:hover { background: var(--brand-050); }
.spec-table tbody td:first-child { font-weight: 700; color: var(--brand-700); }
.table-note { padding: 14px 24px 18px; font-size: 13px; color: var(--ink-3); }

/* ---------- 技术方案 ---------- */
.tech-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.tech-card {
  padding: 32px; border-radius: var(--radius); background: var(--white);
  border: 1px solid var(--line); box-shadow: var(--shadow-sm);
}
.tech-card h3 { font-size: 19px; margin-bottom: 20px; }
.tech-p { color: var(--ink-2); font-size: 15px; margin-bottom: 18px; }
.sensor-list { display: grid; gap: 14px; }
.sensor-list li { padding: 16px 18px; border-radius: 12px; background: var(--soft); border-left: 3px solid var(--brand-500); }
.sensor-list b { display: block; font-size: 15px; margin-bottom: 4px; }
.sensor-list b i { font-style: normal; font-size: 12px; color: var(--ink-3); font-weight: 500; margin-left: 6px; letter-spacing: .04em; }
.sensor-list span { font-size: 14px; color: var(--ink-2); }

.proto-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.proto-tags span {
  padding: 8px 18px; border-radius: 999px; font-size: 14px; font-weight: 700; letter-spacing: .04em;
  background: linear-gradient(135deg, #0d1c46, #1e4fd8); color: #fff;
}
.tech-img { border-radius: 12px; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }

.protect { margin-top: 26px; padding: 40px 44px; border-radius: var(--radius-lg); background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.protect-head { margin-bottom: 24px; }
.protect-head h3 { font-size: 20px; margin-bottom: 8px; }
.protect-head p { color: var(--ink-2); font-size: 15px; }
.protect-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.protect-grid li {
  position: relative; padding: 16px 14px 16px 40px; border-radius: 12px;
  background: var(--soft); font-size: 14px; font-weight: 600; color: var(--ink);
  transition: background .25s var(--ease), color .25s var(--ease);
}
.protect-grid li::before {
  content: "✓"; position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; border-radius: 50%; font-size: 11px; line-height: 18px; text-align: center;
  background: var(--brand-600); color: #fff; font-weight: 700;
}
.protect-grid li:hover { background: var(--brand-050); color: var(--brand-700); }

/* ---------- 应用领域 ---------- */
.app-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 22px; }
.app-card {
  display: flex; flex-direction: column; overflow: hidden;
  border-radius: var(--radius); background: var(--white);
  border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.app-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.app-media { aspect-ratio: 16 / 10; overflow: hidden; background: #eef2f9; }
.app-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
.app-card:hover .app-media img { transform: scale(1.05); }
.app-body { padding: 22px 22px 24px; flex: 1; }
.app-body h3 { font-size: 17.5px; margin-bottom: 8px; }
.app-body p { color: var(--ink-2); font-size: 14.5px; }
.app-card-text { justify-content: center; background: linear-gradient(140deg, #0d1c46, #1c3d97); color: #fff; border: 0; }
.app-card-text .app-body h3 { color: #fff; }
.app-tags { display: grid; gap: 10px; margin-top: 14px; }
.app-tags li { padding: 11px 14px; border-radius: 10px; background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .16); font-size: 14px; }

/* 英文模式下隐藏重复的英文小字（中文为主时作为副标题保留） */
html[lang="en"] [data-en-hide] { display: none !important; }

/* ---------- 应用领域：补充场景 ---------- */
.app-extra-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 26px; }
.app-extra {
  padding: 28px 26px; border-radius: var(--radius);
  background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.app-extra:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: #cfdcf7; }
.app-extra .adv-icon { margin-bottom: 16px; }
.app-extra h3 { font-size: 17.5px; margin-bottom: 9px; }
.app-extra p { color: var(--ink-2); font-size: 14.8px; }

/* ---------- 关于我们 ---------- */
.about-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: start; }
.about-lead { font-size: 18px; font-weight: 600; color: var(--ink); margin-bottom: 18px; }
.about-text p { color: var(--ink-2); margin-bottom: 16px; }
.about-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 26px 0; }
.about-facts > div { padding: 18px; border-radius: 12px; background: var(--white); border: 1px solid var(--line); }
.about-facts b { display: block; font-size: 15px; color: var(--brand-700); margin-bottom: 6px; }
.about-facts span { font-size: 13.5px; color: var(--ink-2); }
.about-en {
  padding-top: 18px; border-top: 1px dashed var(--line);
  font-size: 13.5px; color: var(--ink-3); line-height: 1.7;
}
.about-media { display: grid; gap: 18px; }
.about-photo { margin: 0; border-radius: var(--radius); overflow: hidden; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.about-photo img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.about-photo.small img { aspect-ratio: 16 / 8; }
.about-photo figcaption { padding: 12px 18px; font-size: 13px; color: var(--ink-3); border-top: 1px solid var(--line); }

.process { margin-top: 56px; }
.process h3 { font-size: 20px; margin-bottom: 22px; }
.process-list { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; counter-reset: step; }
.process-list li {
  position: relative; padding: 22px 18px 20px; border-radius: var(--radius);
  background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}
.process-list li:hover { transform: translateY(-4px); border-color: #cfdcf7; }
.process-list li::before {
  counter-increment: step; content: "0" counter(step);
  display: block; font-size: 13px; font-weight: 800; letter-spacing: .1em;
  color: var(--brand-500); margin-bottom: 10px;
}
.process-list b { display: block; font-size: 15.5px; margin-bottom: 6px; }
.process-list span { font-size: 13px; color: var(--ink-2); }

/* ---------- 电子画册 ---------- */
.catalog-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.catalog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.cat-thumb {
  position: relative; padding: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  background: var(--soft); box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.cat-thumb:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.cat-thumb img { width: 100%; aspect-ratio: 16 / 11; object-fit: cover; }
.cat-thumb span {
  position: absolute; left: 8px; bottom: 8px;
  padding: 2px 8px; border-radius: 6px; font-size: 11.5px; font-weight: 700;
  background: rgba(10, 19, 48, .72); color: #fff;
}

/* ---------- 联系我们（浅色区块） ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 48px; align-items: start; }
.contact-subtitle { margin-bottom: 16px; font-size: 17px; color: var(--ink); }

.contact-list { display: grid; gap: 14px; }
/* 职务标签独占一行、姓名与电话依次排在下方，
   这样不管标签字数多少（总经理 / 销售总监 / Technical Director），姓名都从同一位置起始 */
.contact-person {
  display: grid; gap: 3px;
  padding: 20px 22px; border-radius: var(--radius);
  background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.contact-person:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #cfdcf7; }
.cp-role {
  justify-self: start; margin-bottom: 9px; padding: 5px 12px; border-radius: 8px;
  font-size: 12.5px; font-weight: 700; letter-spacing: .04em;
  background: var(--brand-050); color: var(--brand-700); border: 1px solid #d5e0fa;
}
.cp-name { font-size: 18px; line-height: 1.3; color: var(--ink); }
.cp-tel { font-size: 15.5px; font-weight: 700; color: var(--brand-600); letter-spacing: .01em; }
.cp-tel:hover { color: var(--brand-500); }

.contact-meta {
  display: grid; gap: 16px; margin-top: 28px; padding-top: 26px;
  border-top: 1px dashed var(--line);
}
.contact-meta li { display: flex; gap: 16px; }
.ci-icon {
  flex: 0 0 auto; width: 42px; height: 42px; border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--brand-050); color: var(--brand-600); border: 1px solid #d5e0fa;
}
.ci-icon svg { width: 21px; height: 21px; }
.contact-meta b { display: block; font-size: 15px; color: var(--ink); margin-bottom: 4px; }
.contact-meta p { font-size: 14.5px; color: var(--ink-2); }
.contact-meta p.en { font-size: 12.5px; color: var(--ink-3); }
.contact-meta a { color: var(--brand-600); }
.contact-meta a:hover { color: var(--brand-500); }

.contact-form {
  padding: 32px; border-radius: var(--radius-lg);
  background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow);
}
.contact-form h3 { font-size: 20px; margin-bottom: 22px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field { display: block; margin-bottom: 14px; }
.field > span { display: block; font-size: 13.5px; color: var(--ink-2); margin-bottom: 7px; }
.field > span i { font-style: normal; color: #d92d20; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  background: #fbfcfe; border: 1px solid var(--line); color: var(--ink); font-size: 14.5px;
  transition: border-color .25s var(--ease), background .25s var(--ease), box-shadow .25s var(--ease);
}
.field input::placeholder, .field textarea::placeholder { color: var(--ink-3); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--brand-500); background: var(--white);
  box-shadow: 0 0 0 3px rgba(47, 107, 255, .14);
}
.field textarea { resize: vertical; min-height: 96px; }
.field.has-error input, .field.has-error select, .field.has-error textarea {
  border-color: #d92d20; box-shadow: 0 0 0 3px rgba(217, 45, 32, .1);
}
.form-hint { margin-top: 14px; font-size: 14px; color: var(--brand-700); min-height: 1.4em; }
.form-hint.is-error { color: #d92d20; }
.form-note { margin-top: 10px; font-size: 12.5px; color: var(--ink-3); }
.form-note a { color: var(--brand-600); }

/* ---------- 页脚 ---------- */
.site-footer { background: #060d24; color: rgba(255, 255, 255, .72); padding: 66px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.3fr; gap: 40px; }
.brand-footer { margin-bottom: 14px; }
.footer-lockup { height: 108px; width: auto; }
.footer-tagline { margin-bottom: 12px; font-size: 13.5px; letter-spacing: .02em; color: rgba(255, 255, 255, .62); }
.footer-brand p { font-size: 14px; color: rgba(255, 255, 255, .62); }
.footer-brand .en { color: rgba(255, 255, 255, .4); font-size: 12.5px; }
.footer-nav, .footer-contact { display: flex; flex-direction: column; gap: 10px; }
.footer-nav h4, .footer-contact h4 { color: #fff; font-size: 15px; margin-bottom: 6px; }
.footer-nav a { color: rgba(255, 255, 255, .68); font-size: 14.5px; }
.footer-nav a:hover { color: var(--accent); }
.footer-contact p { font-size: 14px; }
.footer-contact a { color: #8fe3ff; }
.footer-tags { display: flex; gap: 8px; margin-top: 6px; }
.footer-tags span { font-size: 12px; padding: 3px 10px; border-radius: 999px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .14); }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px;
  margin-top: 48px; padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, .1);
  font-size: 13px; color: rgba(255, 255, 255, .5);
}
.footer-bottom a { color: rgba(255, 255, 255, .58); }
.footer-bottom a:hover { color: var(--accent); }
.beian { display: flex; flex-wrap: wrap; gap: 8px 18px; }

/* ---------- 404 ---------- */
.nf-actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--brand-500), var(--brand-600));
  color: #fff; border: 0; box-shadow: 0 14px 30px -12px rgba(30, 79, 216, .85);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { transform: translateY(-3px); }

/* ---------- 画册灯箱 ---------- */
.lightbox { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; }
.lightbox[hidden] { display: none; }
.lb-backdrop { position: absolute; inset: 0; background: rgba(4, 8, 22, .86); backdrop-filter: blur(6px); }
.lb-panel { position: relative; max-width: min(1100px, 92vw); max-height: 90vh; display: flex; align-items: center; }
.lb-panel img {
  max-width: 100%; max-height: 86vh; width: auto; border-radius: 12px;
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, .9); background: #fff;
}
.lb-close, .lb-prev, .lb-next {
  position: absolute; z-index: 2; border: 1px solid rgba(255, 255, 255, .24);
  background: rgba(10, 19, 48, .7); color: #fff; border-radius: 50%;
  width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
  font-size: 22px; line-height: 1; backdrop-filter: blur(8px);
  transition: background .25s var(--ease), transform .25s var(--ease);
}
.lb-close { top: -52px; right: 0; }
.lb-prev { left: -22px; top: 50%; transform: translateY(-50%); }
.lb-next { right: -22px; top: 50%; transform: translateY(-50%); }
.lb-prev:hover, .lb-next:hover, .lb-close:hover { background: var(--brand-600); }
.lb-counter {
  position: absolute; bottom: -44px; left: 50%; transform: translateX(-50%);
  font-size: 13.5px; color: rgba(255, 255, 255, .72); letter-spacing: .08em;
}

/* ---------- 图片加载失败占位 ---------- */
.has-fallback { position: relative; }
.has-fallback img { visibility: hidden; }
.has-fallback::after {
  content: "MEIDISI";
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800; letter-spacing: .22em; color: rgba(30, 79, 216, .35);
  background: linear-gradient(140deg, #eef3ff, #dbe5f8);
}

/* ---------- 响应式 ---------- */
/* 英文导航标签更长，窄一些的桌面端先收紧间距，再收起页头按钮，避免换行 */
@media (max-width: 1420px) {
  .nav a { padding: 9px 11px; font-size: 14.5px; }
  .header-actions { gap: 10px; }
}
@media (max-width: 1240px) {
  .header-actions .btn { display: none; }
}

@media (max-width: 1080px) {
  .prod-grid { grid-template-columns: repeat(3, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .data-grid { grid-template-columns: repeat(3, 1fr); }
  .protect-grid { grid-template-columns: repeat(3, 1fr); }
  .catalog-grid { grid-template-columns: repeat(3, 1fr); }
  .process-list { grid-template-columns: repeat(3, 1fr); }
  .nav a { padding: 9px 10px; font-size: 14.5px; }
}

@media (max-width: 900px) {
  :root { --header-h: 68px; }
  .hero { padding-top: calc(var(--header-h) + 48px); }
  .hero-inner { grid-template-columns: 1fr; gap: 44px; padding-bottom: 56px; }
  .hero-visual { max-width: 560px; }
  .float-1 { left: -8px; }
  .float-2 { right: -8px; }
  .float-3 { left: 18px; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    padding: 14px 20px 22px;
    background: rgba(9, 17, 42, .98); backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, .1);
    transform: translateY(-12px); opacity: 0; visibility: hidden;
    transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s;
    max-height: calc(100vh - var(--header-h)); overflow-y: auto;
  }
  .nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .nav a { color: #fff; padding: 14px 12px; font-size: 16px; border-radius: 10px; }
  .nav a:hover { background: rgba(255, 255, 255, .1); }
  .nav a.is-active::after { display: none; }
  .nav-toggle { display: inline-flex; }
  .header-actions .btn { display: none; }

  .section { padding: 72px 0; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); gap: 14px; padding: 22px 8px; }
  .hs-item { border-right: 0; }
  .trustbar-viewport { padding-top: 62px; }
  .adv-grid { grid-template-columns: 1fr; }
  .adv-highlight { grid-template-columns: 1fr; padding: 32px 26px; }
  .tech-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: 1fr; }
  .app-extra-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 34px; }
  .about-facts { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .protect { padding: 30px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .container { padding-inline: 18px; }
  .hero h1 { font-size: 2rem; }
  .header-inner { gap: 10px; }
  .brand-logo { height: 36px; }
  .brand-word { height: 16px; }
  .brand-text small { display: none; }
  .brand-mark svg { width: 34px; height: 34px; }
  .lang-btn { padding: 5px 9px; font-size: 12px; }
  .nav-toggle { width: 40px; height: 40px; }
  .page-hero { padding: calc(var(--header-h) + 40px) 0 44px; }
  .cta-band { padding: 44px 0; }
  .cta-band .container { flex-direction: column; align-items: flex-start; }
  .cta-band-actions .btn { flex: 1 1 100%; }
  .hero-cta .btn { flex: 1 1 100%; }
  .float-card { padding: 9px 12px; }
  .float-card .fc-num { font-size: 16px; }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
  .protect-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-grid { grid-template-columns: 1fr; }
  .catalog-grid { grid-template-columns: repeat(2, 1fr); }
  .process-list { grid-template-columns: 1fr; }
  .app-extra-grid { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  .contact-form { padding: 24px 20px; }
  .lb-prev { left: 6px; }
  .lb-next { right: 6px; }
  .lb-close { top: -50px; right: 0; }
  .to-top { right: 16px; bottom: 16px; }
}

/* ---------- 无障碍：减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 打印 ---------- */
@media print {
  .site-header, .to-top, .hero-bg, .trustbar, .lightbox { display: none !important; }
  body { color: #000; }
  .section { padding: 24px 0; }
}